tolong dijawab ya

<p>rumus kesebangunan segitiga</p><p>(DE)/(AB) =(CE)/(CB)</p><p>dengan nilai CB=CE+BE=CE+4, maka:&nbsp;</p><p>(DE)/(AB) =(CE)/(CB)</p><p>30/36 &nbsp; &nbsp; &nbsp; = CE/ (CE+4)</p><p>30(CE+4) &nbsp;= 36 (CE)</p><p>30.CE+120=36.CE</p><p>120 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 36CE-30CE</p><p>120 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 6CE</p><p>CE &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 120/6</p><p>CE &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 20cm</p><p>&nbsp;</p>